<template>
  <div class="app-container">
    
    <!--查询表单-->
    <el-form :inline="true" class="demo-form-inline">

    <!-- 所属分类：级联下拉列表 -->
    <!-- 一级分类 -->
    <el-form-item label="课程类别">
        <el-select
        v-model="searchObj.subjectParentId"
        placeholder="请选择"
        @change="subjectLevelOneChanged">
        <el-option
            v-for="subject in subjectNestedList"
            :key="subject.id"
            :label="subject.title"
            :value="subject.id"/>
        </el-select>

        <!-- 二级分类 -->
        <el-select v-model="searchObj.subjectId" placeholder="请选择">
        <el-option
            v-for="subject in subSubjectList"
            :key="subject.id"
            :label="subject.title"
            :value="subject.id"/>
        </el-select>
    </el-form-item>

    <!-- 标题 -->
    <el-form-item>
        <el-input v-model="searchObj.title" placeholder="课程标题"/>
    </el-form-item>
    <!-- 讲师 -->
    <el-form-item>
        <el-select
        v-model="searchObj.teacherId"
        placeholder="请选择讲师">
        <el-option
            v-for="teacher in teacherList"
            :key="teacher.id"
            :label="teacher.name"
            :value="teacher.id"/>
        </el-select>
    </el-form-item>

    <el-button type="primary" icon="el-icon-search" @click="getPageList()">查询</el-button>
    <el-button type="default" @click="resetData()">清空</el-button>
    </el-form>

    <!-- 表格 -->
    <el-table
    v-loading="listLoading"
    :data="list"
    element-loading-text="数据加载中"
    border
    fit
    highlight-current-row
    row-class-name="myClassList">

    <el-table-column
        label="序号"
        width="70"
        align="center">
        <template slot-scope="scope">
        {{ (page - 1) * limit + scope.$index + 1 }}
        </template>
    </el-table-column>

    <el-table-column label="课程信息" width="470" align="center">
        <template slot-scope="scope">
        <div class="info">
            <div class="pic">
            <img :src="scope.row.cover" alt="scope.row.title" width="150px">
            </div>
            <div class="title">
            <a href="">{{ scope.row.title }}</a>
            <p>{{ scope.row.lessonNum }}课时</p>
            </div>
        </div>

        </template>
    </el-table-column>

    <el-table-column label="创建时间" align="center">
        <template slot-scope="scope">  
        {{ scope.row.gmtCreate.substr(0, 13) }}
        </template>
    </el-table-column>
    <el-table-column label="发布时间" align="center">
        <template slot-scope="scope">
        {{ scope.row.gmtModified.substr(0, 10) }}
        </template>
    </el-table-column>
    <el-table-column label="价格" width="100" align="center" >
        <template slot-scope="scope">
        {{ Number(scope.row.price) === 0 ? '免费' :
        '¥' + scope.row.price.toFixed(2) }}
        </template>
    </el-table-column>
    <el-table-column prop="buyCount" label="付费学员" width="100" align="center" >
        <template slot-scope="scope">
        {{ scope.row.buyCount }}人
        </template>
    </el-table-column>

    <el-table-column label="操作" width="150" align="center">
        <template slot-scope="scope">
        <router-link :to="'/course/info/'+scope.row.id">
            <el-button type="text" size="mini" icon="el-icon-edit">编辑课程信息</el-button>
        </router-link>
        <router-link :to="'/course/chapter/'+scope.row.id">
            <el-button type="text" size="mini" icon="el-icon-edit">编辑课程大纲</el-button>
        </router-link>
        <el-button type="text" size="mini" icon="el-icon-delete" @click="removeById(scope.row.id)">删除</el-button>
        </template>
    </el-table-column>
    </el-table>

    <!-- 分页 -->
    <el-pagination
        :current-page="page"
        :page-size="limit"
        :total="total"
        style="padding: 30px 0; text-align: center;"
        layout="total, prev, pager, next, jumper"
        @current-change="fetchData"
    />

  </div>
</template>

<script>

import course from "@/api/edu/course.js"
import subject from "@/api/edu/subject"
import teacher from "@/api/edu/teacher"

export default {
    data () {
        return {
            listLoading: true, // 是否显示loading信息
            list: [], // 数据列表
            total: 0, // 总记录数
            page: 1, // 页码
            limit: 10, // 每页记录数
            searchObj: {
                subjectParentId: '',
                subjectId: '',
                title: '',
                teacherId: ''
            }, // 查询条件
            teacherList: [], // 讲师列表
            subjectNestedList: [], // 一级分类列表
            subSubjectList: [] // 二级分类列表,
        }
    },
    created () {
        //1、获取数据集合
        this.getPageList()
        //2、课程分类数据（搜索）
        this.initSubjectList()
        //3、讲师列表数据
        this.initTeacherList()
    },
    methods: {
        getPageList(page = 1){
            this.page = page
            course.getPageList(this.page, this.limit, this.searchObj)
                .then(response => {
                    this.list = response.data.rows
                    this.total = response.data.total
                    this.listLoading=false
                })
        },
        // 初始化 课程分类列表
        initSubjectList(){
            subject.getNestedTreeList()
            .then(response =>{
                this.subjectNestedList = response.data.subjectList
            })
        },
        initTeacherList(){
            teacher.getList()
                .then(response => {
                this.teacherList = response.data.items
                })
        },
        subjectLevelOneChanged(value){
            for(var i = 0; i < this.subjectNestedList.length; i++){
                if(this.subjectNestedList[i].id == value){
                    this.subSubjectList = this.subjectNestedList[i].children
                    this.searchObj.subjectId = ''
                }
            }
        },
        resetData(){
            this.searchObj = {
                subjectParentId: '',
                subjectId: '',
                title: '',
                teacherId: ''
            }
            this.subSubjectList = [] // 二级分类列表
            this.getPageList()
        },
        removeById(id){
            // debugger
            this.$confirm('此操作将永久删除该课程，以及该课程下的章节和视频，是否继续?', '提示', {
                confirmButtonText: '确定',
                
                type: 'warning'
            }).then(() => {
            //alert("id: "+ id +" -- "+ "请到8001-swagger/course/delete/删除此信息")
            console.log(id)
            return course.removeById(id)
            }).then(() => {
                this.getPageList()
                this.$message({
                    type: 'success',
                    message: '删除成功!'
                })
            })


        }
    }
}
</script>

<style scoped>
.myClassList .info {
    width: 450px;
    overflow: hidden;
}
.myClassList .info .pic {
    width: 150px;
    height: 90px;
    overflow: hidden;
    float: left;
}
.myClassList .info .pic a {
    display: block;
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
}
.myClassList .info .pic img {
    display: block;
    width: 100%;
}
.myClassList td .info .title {
    width: 280px;
    float: right;
    height: 90px;
}
.myClassList td .info .title a {
    display: block;
    height: 48px;
    line-height: 24px;
    overflow: hidden;
    color: #00baf2;
    margin-bottom: 12px;
}
.myClassList td .info .title p {
    line-height: 20px;
    margin-top: 5px;
    color: #818181;
}
</style>
